MRTK3: Update the MRTK learning path on learn.microsoft.com to use MRTK3 instead of MRTK2

[AMollis]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/issues/176

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Describe the problem

The MRTK learning paths at https://learn.microsoft.com/en-us/training/paths/beginner-hololens-2-tutorials/ uses MRTK2. Once MRTK3 reaches GA, the learning paths should be updated to use the preferred version of the toolkit.

Describe the solution you'd like

The MRTK learning paths that use MRTK2 that should be updated (tutorial and code):

• [ ] Introduction to the Mixed Reality Toolkit-Set Up Your Project and Use Hand Interaction
• [ ] Place a Mars Rover object in the scene and work with grids and intelligent object tracking
• [ ] Getting started with 3D object interaction
• [ ] Enable eye-tracking and voice commands for objects on the HoloLens 2
• [ ] Use Azure Spatial Anchors to anchor objects in the real world
• [ ] Add Azure Cognitive Services to your mixed reality project
• [ ] Activate spatial audio for your HoloLens 2 application
• [ ] Integrate Azure Cloud Services to your Unity project on HoloLens 2
• [ ] Create a Holographic Remoting app to visualize 3D content on HoloLens 2

Describe alternatives you've considered

Samples not updated.

Additional context

Full list of learning path demos can be found at https://learn.microsoft.com/en-us/training/paths/beginner-hololens-2-tutorials/

[AMollis]

Majority of work is done here. Remaining tasks are:

• https://github.com/microsoft/MixedRealityToolkit-Unity/issues/11676
• https://github.com/microsoft/MixedRealityToolkit-Unity/issues/11675
• https://github.com/microsoft/MixedRealityToolkit-Unity/issues/11674